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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
On the following table is the data for both Mean Velocity and Peak Velocity. Correlation between best scores of Peak Velocity and Mean Velocity is 0,974. Average CV% (coefficient of variation) for sets calculated with Mean Velocity is 2,38% and for Peak Velocity it is 3,37%, which is 42% bigger.